FANS of the man bun beware: donning the top knot daily may contribute to baldness.
Worn by the likes of Harry Styles, Leonardo Dicaprio and Jared Leto, the rise in men tying their hair up has brought with it an increase in a condition called traction alopecia.
A Mississippi based dermatologist has spoken out about the growing number of men she sees with the condition, identified by bald patches around the head and temples.
Described as having a similar effect to tweezing eyebrows, if the hair is pulled too tightly tension is placed on the roots and hair follicles and eventually the hair will cease to grow.
Dermatologist Sabra Sullivan told MIC: "Traction alopecia in men is becoming really, really common.
"I see it probably once or twice a week. They're putting traction on the hair follicles that the hair is not really meant to take."
Sullivan says once the hair follicle is damaged, it doesn't grow back.
The answer to avoiding what's being likened to a hairband of baldness around the face is to go for a looser bun to relieve tension on strands.